Fixed
Created: Dec 10, 2019
Updated: Jan 9, 2020
Resolved Date: Dec 31, 2019
Found In Version: 10.19.45.1
Fix Version: 10.19.45.3
Severity: Standard
Applicable for: Wind River Linux LTS 19
Component/s: Userspace
All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos authentication, by forcing all tickets for these clients to be non-forwardable. In AD this is implemented by a user attribute delegation_not_allowed (aka not-delegated), which translates to disallow-forwardable. However the Samba AD DC does not do that for S4U2Self and does set the forwardable flag even if the impersonated client has the not-delegated flag set.
CREATE(Triage):(User=admin) [CVE-2019-14870|https://nvd.nist.gov/vuln/detail/CVE-2019-14870]
